Elementary Algebra

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The manager of a farmer's market has 500lb of grain that costs $1.20 per pound. How many pounds of meal costing $.80 per pound should be mixed with the 500lb of grain to produce a mixture that costs $1.05 per pound?

  • Elementary Algebra -

    let the amount to be added be x lb

    1.2(500) + .8x = 1.05(500+x)
    600 + .8x = 525 + 1.05x
    -025x = -75
    x = -75/-.25 = 300

    300 lb of the cheaper grain should be added

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